21243041140 has 48 divisors (see below), whose sum is σ = 46605721680. Its totient is φ = 8122956800.

The previous prime is 21243041129. The next prime is 21243041147. The reversal of 21243041140 is 4114034212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 111767184 + 21131273956 = 10572^2 + 145366^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243041147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122737 + ... + 239896.

It is an arithmetic number, because the mean of its divisors is an integer number (970952535).

Almost surely, 2^21243041140 is an apocalyptic number.

21243041140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21243041140 is an abundant number, since it is smaller than the sum of its proper divisors (25362680540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21243041140 is a wasteful number, since it uses less digits than its factorization.

21243041140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362772 (or 362770 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21243041140 its reverse (4114034212), we get a palindrome (25357075352).

The spelling of 21243041140 in words is "twenty-one billion, two hundred forty-three million, forty-one thousand, one hundred forty".